31. Neoadjuvant Endocrine Therapy in Breast Cancer Up-Regulates the Cytotoxic Drug Pump ABCG2/BCRP, and May Lead to Resistance to Subsequent Chemotherapy. Issue 11 (November 2018) - Kim, Baek; Baxter, Diana; Hanby, Andrew; Verghese, Eldo; Sims, Andrew; Hughes, Thomas